adding thumbnails and updated footer logos
Fetch contributions by candidate.
update footer
Merge pull request #210 from elinaru/thumbnail-photos

Adding thumbnails and updated footer logos
Add contributions.self_contribution boolean column
Add /api/contributions/zip

This returns data in the correct format for @vbrown608's graph so that
we don't have to ship 2 MB of JSON down.

Closes #207
Merge remote-tracking branch 'vivian/master'

* vivian/master:
  Refactor code for candidate tooltips.
  Add tooltips to candidate chart view.
  Hide tooltip on mouseleave
  Remove hard-coded references to parent div name.
  Add contribution info to overview tooltip
  Begin addiing tooltip
Merge remote-tracking branch 'mike/PerCandidate'

* mike/PerCandidate:
  Fetch contributions by candidate.

Conflicts:
	app.rb
Added Oakland to header
Comment out Vivian's pride and joy

Temporarily :(
Merge pull request #211 from elinaru/thumbnail-photos

Added Oakland to header
Merge pull request #213 from vbrown608/master

Clean up zip code chart styles
Update zip code chart to use processed summary data from backend.